NullStream.h

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/*
 * Copyright (C) 2025 Andrew S. Rightenburg
 * Bash++: Bash with classes
 * SPDX-License-Identifier: GPL-3.0-or-later
 */
 
#pragma once
 
#include <streambuf>
#include <ostream>
 
class NullBuffer : public std::streambuf {
    protected:
        int overflow(int c) override {
            return traits_type::not_eof(c); // Indicate success, but discard the character
        }
 
        std::streamsize xsputn(const char* /*s*/, std::streamsize n) override {
            return n; // Indicate success, but discard the characters
        }
    public:
        NullBuffer() noexcept = default;
        NullBuffer(const NullBuffer&) noexcept = default;
        NullBuffer& operator=(const NullBuffer&) noexcept = default;
        NullBuffer(NullBuffer&&) noexcept = default;
        NullBuffer& operator=(NullBuffer&&) noexcept = default;
        ~NullBuffer() noexcept override = default;
};
 
class NullOStream : public std::ostream {
    private:
        inline static NullBuffer null_buffer;
    public:
        NullOStream() : std::ostream(&null_buffer) {}
};